Supplementary radiant heat cooling fins



1944- v. R. ABRAMS SUPPLEMENTARY RADIANT HEAT COOLING FINS Filed Aug. 12

Vi ct or R -A I;

My: $145M heat Patented Feb. 8, 1944 UNITED STATES PATENT OFFICE2,340,855 SUPPLEMENTARY Rl lllgflsANT HEAT COOLING Victor B. Abrams,Maplewood, N. J. Application August 12, 1942, Serial No. 454,512 2Claims. (01. 257-261) (Granted under the act of March 3, 1883, as

amended April 30, 1928; 370

The invention described herein may be manufactured and used by or forthe Government for governmental purposes, without the payment to me ofany royalty thereon.

This invention relates to air-cooling means and in particular pertainsto a device for utilizing a greater degree of radiation combined withconduction by means of auxiliary conducting elements inserted betweenthe vanes of conventional air-cooled bodies such as engine cylinders andthe like.

It is therefore an object of the invention to provide means for a morerapid and eflicient removal of heat from the air-cooled bodies. Afurther object is to provide for the more eflicient removal fromair-cooled bodies having cooling vanes by inserting a heat-conductingmember between adjacent vanes. Still another object is to enlarge theeflective radiation area from vaned, air-cooled bodies.

The specific nature of the invention as well as other objects andadvantages thereof will clearly appear from a description of a preferredembodiment as shown in the accompanying drawing in which:

Fig. 1 is an elevational view of a portion of a radial engine with vanedcylinders.

Fig. 2 is a section taken on the line 2-2 of Fig. 1.

Fig. 3 is a view of an auxiliary vane unit as in Fig. 1 but separatefrom the motor assembly,

Fig. 4 is a view similar to Fig. 3 showing a modiflcation, and

Fig. 5 is a detail of an auxiliary fin support.

Referring to the drawing by characters of reference there is shown amotor l'having radial cylinders 2 with ribs or vanes 3 to increase theair-contacting surface, although it will be understood that the radialtype is merely for purposes of illustration, and the invention may bepractised with other types of engines such as V types and in-linecylinders. Extending into the recesses between vanes are metal sheets 4comprising complementar parts meeting in the line 5 and having arcuateportions 6 conforming to the peripheries of the cylinders. may besupported in any convenient manner so that the arcuate portions aremaintained approximately midway between the cooling vanes 3. As shownthis is accomplished by means of uprights fastened to the engine andcomprising an outer member I, and an inner member 8 slotted as at 9 toreceive the edges of adjacent sheets 4. The supports shown may beomitted since the vanes can be self-sustaining both by reason of theirconfiguration and by additional means such as dimples l2 struck in thevanes as shown in Fig. 4.

The sheets 4 Support between sheets is afiorded by straps llperpendicular to the sheets and fastened by riveted flanges II or othersuitable means such as spot welding. Since bailles are usually desirablein the type of cooling the'straps in are curved to accomplish thisadditional function of diverting the air to the rear of the cylinders.The bailles will preferably have a front opening l3 to allow cooling airto reach all parts of the vanes, but it will be understood that in somecases the baiiles will be closed throughout their length.

It will be seen that whereas the usual ribbed type of body for coolingoffers considerable advantage with respect to the increased surfacewhich the cooling air may reach, this is purely a conduction effect. Theradiation rate is not increased since the radiation area; remains as theprojected area of the cylinder wall, the same as if the ribs were notpresent. The sides of the ribs are merely looking at each other" and theresultant of their radiation is very nearly zero. By reaching in with anauxiliary cooler vane radiant heat transfer is brought into play andcontributes to the heat exchange, the radiated heat being carried off byconduction through the auxiliary fins which present a considerablesurface to the air stream for dissipation of the heat. thus preventingthat portion of the auxiliary fins between the cooling ribs fromapproaching the condition of radiant heat blockage which obtains in theconventional grooves without the auxiliary conducting member.

In addition to supplementary heat exchange by transfer of radiant energya second cooling effect is introduced by the interposed auxiliary fins.This action depends on the cooling of the air mass by the auxiliary finbelow the temperature to which it has been heated by the cylinder fin.

loss of heat maintains a greater temperature differential between theengine fln and the cooling air and hence promotes a greater heatexchange.

While. an auxiliary vane has been shown extending into each trough, itmay be expedient. where the ribs are closely bunched as they usually arein the straight portion of the cylinder, to

,place the vanes in alternate troughs. Thus each rib will have aradiation outlet, although only one side of any rib will in this casecontribute to the heat transfer.

It will be understood that the particular form and extent of theauxiliary vanes shown and the manner of mounting are for illustrativepurposes and these details may be varied in considerable degree withoutdeparting from the spirit of the invention as defined in the appendedclaims.

I claim:

1. In an apparatus having cylinders with corrugations, auxiliary vanesbetween saidcylinders and having end portions complementary in shape tothe periphery of said cylinders and spaced therefrom, means on theapparatus to support said vanes, spacing straps secured to and be-

